language: fix typos

Change-Id: Ie1634d06461490ffc12ddf38f86135a68dfac2a9
Reviewed-on: https://go-review.googlesource.com/46851
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matt Layher <mdlayher@gmail.com>
Reviewed-by: Nigel Tao <nigeltao@golang.org>
1 file changed